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RECENT ACCOUNTING PRONOUNCEMENTS Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jan. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  | $ (388,226) | $ (389,136) |  |  |
Contract with Customer, Liability |  |  | 900 |  |  |  |
Royalty revenue |  |  | 1,850 | $ 1,901 | $ 2,872 |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ 100 | $ 300 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax |  | $ 29,300 |  |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  | $ 1,400
Contract with Customer, Liability |  |  |  |  |  |  | 1,000
Accrued Royalties |  |  |  |  |  |  | $ 400
Royalty revenue |  |  | 400 |  |  |  |
Royalties Receivable |  |  | 700 |  |  |  |
Accrued Liabilities [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Contract with Customer, Liability |  |  | 100 |  |  |  |
Other Liabilities [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Contract with Customer, Liability |  |  | $ 800 |  |  |  |
Scenario, Forecast | Minimum | Accounting Standards Update 2016-02 |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Operating Lease, Liability |  |  |  |  |  | $ 35,000 |
Operating Lease, Right-of-Use Asset |  |  |  |  |  | 26,000 |
Scenario, Forecast | Maximum | Accounting Standards Update 2016-02 |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Operating Lease, Liability |  |  |  |  |  | 38,000 |
Operating Lease, Right-of-Use Asset |  |  |  |  |  | $ 29,000 |

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